Bursting the Bubble Tulips were the first, but they won’t be the last. What forms a “bubble” and what causes them to burst? Share | Have A Question About This Topic? Name Email Address Message Thank you! Oops! Related Content Red Flags for Tax Auditors Here are six flags that may make your tax return prime for an IRS audit. Taxable vs. Tax-Deferred Savings Use this calculator to compare the future value of investments with different tax consequences. Lifetime of Earnings Estimate how much you have the potential to earn during your working years.